Slewing Bearings: The Rotating Joints of Construction Machinery and Industrial Equipment

A slewing bearing, also known as a slewing ring or turntable bearing, is a large bearing capable of simultaneously withstanding axial force, radial force, and tilting moment—known as the "joint of machines." Henan Sankuang Machinery Technology Co., Ltd. specializes in manufacturing various types of slewing bearing products, providing reliable rotation solutions for global construction machinery, mining machinery, wind power generation, and other fields.

What is a Slewing Bearing?

A slewing bearing is a large bearing with a special structure, typically composed of an inner ring, outer ring, rolling elements, and spacers. Unlike ordinary bearings, slewing bearings can withstand composite loads simultaneously—axial load, radial load, and overturning moment—making them widely used in mechanical equipment requiring relative rotary motion.

The slewing bearings produced by Henan Sankuang Machinery are made of high-quality alloy steels such as 50Mn and 42CrMo, undergoing multiple precision processes including forging, heat treatment, raceway machining, and gear processing, ensuring high strength, high wear resistance, and long service life.

Structural Types of Slewing Rings

According to different structural forms, slewing rings are mainly divided into the following types:

1. Single-row Four-point Contact Ball Slewing BearingThis is the most common type of slewing bearing, with compact structure and light weight, capable of simultaneously withstanding axial force, radial force, and tilting moment. It is widely used in construction machinery such as cranes, excavators, and loaders.

2. Double-row Different-diameter Ball Slewing BearingUsing two rows of steel balls with different diameters, it has higher load-bearing capacity than single-row four-point contact ball type, suitable for medium-load rotary machinery.

3. Three-row Roller Slewing BearingWith three-row roller structure, it has the strongest load-bearing capacity, especially suitable for heavy-duty conditions such as mining machinery, port machinery, and metallurgical equipment.

4. Crossed Roller Slewing BearingRollers are arranged at 90° cross angles with good rigidity and high rotation accuracy, suitable for occasions requiring high precision such as CNC machine tools and radar antennas.

We can recommend the most suitable slewing ring structure type according to customers' specific working condition requirements, and provide customized design services.

Application Fields of Turntable Bearings

As important mechanical foundation components, turntable bearings have a very wide range of applications:

Construction Machinery FieldThe slewing mechanisms of excavators, cranes, rotary drilling rigs, concrete pump trucks, aerial work platforms, and other equipment all rely on turntable bearing support.

Wind Power Generation FieldWind turbine yaw systems and pitch systems extensively use slewing bearings, ensuring that wind turbines can adjust angles according to wind direction and capture wind energy to the maximum extent.

Mining and Metallurgy FieldLarge equipment such as ball mills, rotary kilns, continuous casters, and stacker-reclaimers require large-size slewing bearings to withstand enormous loads.

Port and Marine FieldEquipment such as quay cranes, yard cranes, marine cranes, and offshore platforms have high requirements for the reliability and corrosion resistance of slewing bearings.

Our Advantages

• Complete Specifications: Outer diameter from 200mm to 6000mm, covering the full range of products from small to super large

• Reliable Quality: Strictly produced according to ISO, DIN, GB and other standards, certified by ISO9001 quality system

• Fast Delivery: Large inventory of conventional models in stock, special models can be quickly organized for production

• Technical Support: Professional engineer team provides selection guidance and technical consultation

Contact Us

Henan Sankuang Machinery Technology Co., Ltd. focuses on the R&D and manufacturing of slewing bearings, with products exported to Russia, Ukraine, Kazakhstan, Brazil, South Africa, and other countries and regions. If you need high-quality slewing bearing products, please feel free to contact us.

Contact Email: 451949422@qq.com